Coulomb blockade phenomenon in ultra-thin gold nanowires

Hoël Guerin, Masanori Yoshihira, Hiroaki Kura, Tomoyuki Ogawa, Tetsuya Sato, Hideyuki Maki

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Ultra-thin gold nanowires with uniform diameters of 2 nm and lengths of over 100 μm are synthesized via the reduction of gold(III) chloride in an oleylamine matrix. The gold nanowires, dispersed on an oxidized substrate, are top-contacted with metallic electrodes to manufacture back gated transistors. We investigate the transport properties in the fabricated devices as a function of the gate voltage, the bias voltage, and the temperature. The nonlinear current-bias voltage characteristics from 7 K up to 300 K are well described by the Coulomb blockade model in a nearly one-dimensional quantum dot array (which results from the gold nanowires' thermal fragmentation into a granular material). Our results support a picture in which the electronic transport is governed by sequential tunneling at an applied bias above the global Coulomb blockade threshold, whereas in the Coulomb blockade regime, inelastic cotunneling is dominant up to 70 K, at which point it crosses over to activated behavior. The current dependence on the gate voltage that shows irregular oscillations is well explained by the superimposition of Coulomb oscillation patterns generated by each different dot in the one-dimensional array. We find that the competitive effects of excitation energy and stochastic Coulomb blockade balance the number of current peaks observed.

Original languageEnglish
Article number054304
JournalJournal of Applied Physics
Volume111
Issue number5
DOIs
Publication statusPublished - 2012 Mar 1

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nanowires
gold
electric potential
oscillations
granular materials
fragmentation
transistors
transport properties
chlorides
quantum dots
thresholds
electrodes
matrices
electronics
excitation
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Coulomb blockade phenomenon in ultra-thin gold nanowires. / Guerin, Hoël; Yoshihira, Masanori; Kura, Hiroaki; Ogawa, Tomoyuki; Sato, Tetsuya; Maki, Hideyuki.

In: Journal of Applied Physics, Vol. 111, No. 5, 054304, 01.03.2012.

Research output: Contribution to journalArticle

Guerin, Hoël ; Yoshihira, Masanori ; Kura, Hiroaki ; Ogawa, Tomoyuki ; Sato, Tetsuya ; Maki, Hideyuki. / Coulomb blockade phenomenon in ultra-thin gold nanowires. In: Journal of Applied Physics. 2012 ; Vol. 111, No. 5.
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